Corrugated sandwich panel and method for manufacturing the same

Abstract

Disclosed is a method for preparing a corrugated sandwich panel including the steps of: extruding melted polyethylene resin by use of an extruder and a slit nozzle; molding the extruded polyethylene resin to a vertically corrugated inner sheet by use of a plurality of molding rolls; supplying a lower sheet from the lower portion of the inner sheet and an upper sheet from the upper portion thereof; forming a plurality of melting grooves by use of heaters each provided between the upper sheet and the inner sheet and between the lower sheet and the inner sheet such that the melting and bonding between the upper sheet and the inner sheet and between the lower sheet and the inner sheet is conducted; and pressing the upper sheet, the inner sheet and the lower sheet each having the plurality of melting grooves formed thereon by use of a plurality of press rolls.

1 - 9 . (canceled)  
     
     
         10 . A corrugated sandwich panel comprising: 
 a lower sheet;    a corrugated inner sheet; and    an upper sheet;    wherein the inner sheet vertically corrugated as a reinforced member in a such manner as to be inserted and melt-bonded between the upper sheet and lower sheet and each of the sheets has a plurality of melting grooves formed by use of heaters each provided between the upper sheet and the inner sheet and between the lower sheet and the inner sheet.    
     
     
         11 . The corrugated sandwich panel of  claim 10  in which the thickness of all said sheets is about 4 mm and the total thickness of the sandwich panel is about 65 mm.  
     
     
         12 . The corrugated sandwich panel of  claim 10  in which said inner sheet is prepared with recycled polyethylene resin.